武汉城市圈耕地非农化时空特征及其与粮食产量的关系

城市化和工业化的发展促使部分耕地非农化，必将对粮食安全产生影响。以城市化和工业化发展较快的武汉城市圈为例，探索了1992—2007年间该区域耕地非农化的时空特征及其对粮食产量的影响。研究结论如下：①武汉城市圈耕地非农化速度高于湖北省的整体水平；该区域大部分县域单元的耕地面积和人均耕地面积均呈现减少态势。②各县域单元耕地非农化速度与区位有密切的联系；区位好的县域单元，耕地非农化速度相对较快，反之则反。③从等级划分角度分析，大部分县域单元的耕地非农化规模与耕地非农化速度相一致。④属于高、中产田的县域单元耕地非农化的数量相对较少。⑤耕地非农化不一定会引起粮食产量的减少，还取决于粮食单产的变化方向和变化程度等因素。⑥因耕地非农化而造成的粮食减产规模与耕地非农化规模在空间上基本保持一致；每年武汉城市圈因耕地非农化而造成的粮食减产，相当于147万人的粮食消费量。图2，表4，参16。

Temporal and Spatial Characteristics Analysis of Relation between Arable Land Non-agricutlturazalition and Grain Productivity in Wuhan Urban Circle

The development of urbanization and industrialization lead to some farmland conversion, which has an impact on food security. This paper takes Wuhan Urban Circle where urbanization and industrialization develop rapidly as an example, and explores the tem- poral and spatial characteristics of farmland conversion and its impact on grain yield from1992 to 2007 in the region. Results show that （1）Arable land non-agriculturalizatiou speed of Wuhan Urban Circle is faster than the overall level of Hubci Province. The quantity of arable land and per capita arable land area of most county-level units show a decreasing trend in the region（2）Arable land non-agricul- turalization speed has closely relation to its location in all county-level units. In general, the units where in good location have rapid rate of arable land non-agriculturalization. （3） The scale and pace of arable land non-agrieulturalization always are consistent in farmland conversion units. （4）The units where grain yield relatively higher per area have small quantity of arable land conversion. （~）Arable land loss does not necessarily lead to reduction of grain production, which is also relied on the direction and degree of grain yield per area. （6）For the aspect of spatial layout, the areas of grain loss by arable land loss are consistent with arable land loss. The grain loss by arable land loss can supply 1.47 million persons in the regain every year.